Symmetric encryption, used for data storage only loses about half its key strength to a quantum computer, due to Grover's algorithm. So if you are using a 256

Symmetric encryption, used for data storage only loses about half its key strength to a quantum computer, due to Grover's algorithm. So if you are using a 256 bit key you're still fine. Even a 128 bit key would still have 64 bit strength, which would still be a huge amount of work to crack, even though theoretically possible.